Mechanical pencil



mmm

May 6 1924. T. E. WRIGHT MECHANICAL PENCIL y r ,1 A Wm.. 1

Patented May '6, 1924.

THOMAS'E. WRIGHT, OF BROOKLYN, NEW YORK.

MECHANICAL rauen..

Application -mea may 17, 1922. snal ,110. sst-ooe..

To all whom t may cof/wem.'

Be it known that I, THOMAS a citizen of the United States, and aresldent of the borough of Brooklyn in the count of Kings and city andtate of New ork, have invented certain new and useful Improvements inMechanical Pencils, of which the following is` a. specification.`improvements relate to mechanical My pencils, so called commercially, ofthe type in which the lead is forcibly projected through the tip thereofin a manner now well known in the art; and are designed to attainsimplicityand economy in construction, as well as to facilitatemanipulationas hereinafter fully set forth,-the invention consistingsubstantially in the specific combination and arrangement of 7parte `andappurtenances described and claimed.

In the accompanying drawings vI exemplify a practical embodiment of theessential features of my improvements in a encil of the classdesignated, although do not limit myself to the identical form andconstruction of component parts shown, since various modifications andequivalent mechanical expediente may be resorted to in details with likeresult, and vwithout de parting from the spirit and intent of myinvention in this respect.

With this understanding,

Fig. 1, represents a central longitudinal v section of a pencil casing,showing the adjunctive and contained and in operative co-relation:

Fig. 2, is a. sectional elevation showin the operative parts withdrawnin paru om the casing: l

Fig. 3, is a perspective view of the actuating screw, head, and nut:

Fig. 4, 'is a central longitudinal section of the tubular screw, headand lead magazine:

Fig. 5, is a .sectional elevation of the lower or tip end ofthe pencil,showing a lead in position for use and advancement:

(liig. 6, is a persptive view of the push ro Fig.k 7 vis a transversesection taken upon Fig. 9, is'a transverse section4l taken upon plane ofline 9-9 Fig.,1:

E, WRIGHT,

parts' in elevation:

Fig. 10, is an end elevation of the actuatingscrew nut: 1g.' 11, is atransverse section like Fig. 8, and taken on lane of line 8 8, Fig. 1,showing a modi cationfin the form of shell orcasmg;

Fig. 12, is a transverse Isection like unto Fig. 9, and taken on the`same plane 9-9 Fig. 1, of -the .modification shown in Fig. 11. K

The outer shell for casing C, of tubular construction, is formed with atruncated conoidal end portion c, into the extremity of lwhich .the .tipt, is screwed, the y'axial channel in said ti. t affording a close fitfior. the portion of t e lead Z, accommodatedl therein, so that thesaidflead Z will be held normally against displacement by 'fric-.tionalcontact or, technically, by a forced itwhich will vnot however preventthe advance of the lead under screw pressure as' hereinafter set forth.

u The main portion of the tubular casing C,

beyond the truncated conoida-l end c, there- 1 of, may be Y'circular incross section, (or substantially so) as lshown in Figs. 11 and 12, or itmayy be of any polygonal form, or even trian lar, in cross section,being so constructe as to prevent the rotation of the travelli nut N,which acts as' the mount and ve icle for the lead feed plunger P, assubsequently explainedthe 4peripheral surfaces ofsaid non-rotativetravelllng nut N, being of course correspondingly formed for contactualengagementl with the inner surfaces of said' casing C whatever the formthereof in cross section.

Thus in lall but Figs. 11 and 12 of the drawings the use, by wg o fexempliication, of an hexagonal nut is illustrated, the tubular casingC, being correspondingly hexagonal in internal cross section,`where N,essentially cylindrical, or of circular peripheral configuration,-isillustrated', in'

which case the nut N is formed on one or more peripheral sides with alongitudinal groove n', and the -body of the casing C1, iscorrespondingl formed with one or more longitudinal. ri c', as indicatedmore particularly in Fig. 12, of the drawings.

The non-rotative vtravellin nut and plunger carrier N,` is formed or enagement with the male screw thread S, whic is pref- J, erabl reversible,so as to function when positioned in either direction, 'llhat is tosay,-

`each extremity of said nut-actuating screw S, is formed with ak taperednipple s, having a relatively tine peripheral screw thread as comparedwith the relatively coarse vthread of the "main or medial portionof saidactuating screw S. .By this duplication of nipple construction eitherendy of the actuating screw S is ,adapted for engagement with thecorrespondingly screw-tapped (7') inner end of the rotor tube R, whichlatter also incidentally, functions as a holder for replace-I ment leadsZ. This duplexv nipple end con-A figuration 8, s, of the actuating screwS, is shown more particularly inlig. 2 of the drawings.

The rotor tube R, is held in position normally on the outer end of .thecasing C, by means of an inturned snap 'shoulder or boss 0*, as shownmore particularly in Figs. 1 and I' 7 of the drawings, said snap bosse",engagcover for the lead' 4a A `rically ingwith the sides 'of an annulargroove 1", on the peripheral surfaceof the rotor tube R, and therebypreventing lon i'tudinal movement in either direction of t e rotor R,and' of the actuating screw S attached thereto as aforesaid.

The end section r2, of the rotor 'tube R, protuberant beyond the end ofthecasing, constitutes the handle or knob for manipulative purposes,being reerably, although not necessarily, Aof cy 'ndrical form andyknurled peri herally, or otherwise 'formed imate y to,

; of, said slot s2, being for the accommodation of the lead-feed plungerl?. The latter is formed` medially with shoulders 72,12, for

, engagement with the opposite-sides of the non-rotative travelling nutN, which latter is formed with a slot n on one side thereof to admitg'ofits straddling said lead-feed plunger P.. Both ends p', p', of theplunger P, are 'ot the sainel length and configuration,

andv hence, like the actuatin screw itself, the plunger is reversible,an will. function in either direction, its ocebeing to trans'-V init themotion and, ower derived from the actuating screw S t rough the mediumof the nen-rotative travellin nut N, en which it is mounted, tc the leadpositienedin the tip t, and in the herev e ci the nipple s, in-

inearre volved, as indicated more particularly in Fig. 5 of thedrawings. Y

rlhe non-rotative nut N, is, on one side, formed with a concave Hare n?,to admit of its insertion or withdrawal, past the sna boss c", of thetubular casing C, and this concave flare .01.2, is preferably coincidentywith, and constitutes the entrance to, the

slot n', formedl tor the reception of the shank v or medial portion ofthe type feed plunger/ P. rlhis construction of nut N, will be understood by reference more particularly toI Fig. 10, of the drawings.

`It is obvious ,from the foregoing that, with the parts assembled and inthe relative positions shown for instance, i-n Fig. 1, the turning ofthe rotor R in eitherdirec'tion'wll cause the actuating screw S, toadvance lor retract. the non-rotative lnut N, and with it the lead-feedplunger P. Thus the pressure on the inner end of the lead Z, in the tipt, may be relaxed, as when itis desired to force the outer end -of saidlead backward into sired to force the end of said lead l, outward be ondthe tip t, to compensate for wear etc.

en it is desirable to elect replacement of a lead Z, a sharp pull on therotor R will release it fromthe snap boss c* of the casing C, and permitof the withdrawal there? from, bodily, of the actuating screw S,nonsaidtip t, or augmented, as `when it isvv derotative nut N, andplunger P,-`the saidy snap boss c", affording the onlyresistance to v beovercome in this lrespect.

When the operative parts are then withdrawn from tliecasing C, the rotorR, may

be. unscrewed from the nipple s of theactu-l .atmg/ screw S, to which itwas attached, and

a fresh lead l, may be withdrawn from the reservoir?I through the taphole.

This being accom lished, the rotor isv los.

again screwed ontojt e actuating screw S,

but to the opposite nipple s, thereof,-or in other, words the actuatingscrew S, is inverted or reversed, so as to bring thev non-rotative nut Nand plunger P into operative position for 'immediate use after theopera-l tivev parts are again inserted in the casing C, thus obviatingthe necessity for rotating the nut N on the actuatin screwS,-back to thestarting point so as to ring the feed plunger P into position for actionon the re lacement lead Z; The latter is inserted in t e bore s',

` ofthe reversed or tip end nipple of the `actuating screw S, it beingunderstood, of course, that both ends of the said screw S are alike instructure and that the nipples s, a, are duplicates. f

Thus repared for renewal of service, t e operative parts are orcibreinserted in the tubular casin C, untill the snap Mss again engages'with the annular, groovel r', in the periphery of the rotor R, when thedevice again is ready for iininediate use.' f

encil connection, is the fact that there is abso- An important featureto belno'ted in this lutely no unscrewing of parts involved in eitherthe withdrawal orreinstatement of the operative parts as related tothecontainer or casing C, a simple vpull or push,

exertedinl alignment withtthe central longitudinal axisof said parts asassembled being v amply suiiicient to overcome the resistance priorstate of the art is, cheapness .combined simple bot'lrin construction anl to be subjected. There are no com licated.

with durability, the operative arts being o eration, and well calculatedto withstand 't e rough usagel to which such implements are liablemechanical expedients involved, and internal stress and wear isypractically eliminated.

What I claim as my invention and desire to secure by Letters Patent is,l

1. A mechanical pencil of the character designated comprisln a tubularcasing formed with a lead ho ding tip, a lead-feed plunger, formed withlateral shoulders for engagement with a travelling nut, said travellingnut on which said lunger is mounted,

means for rendering said nut-non-rotative within the casing, a-longitudinally slotted actuating screw engaging said non-rotative nut,and. extraneous means for turning said actuating screw on its axis in'either direction, substantially in vthe manner and for the purposedescribed.

2. A mechanical pencil ,of the character designated, comprising atubular casing internally polygonal in cross section and formed with alead holdin tip, a reversible lead-feed plunger, a travel in nut onwhich said plun er is mounted, sai nutl conforming perip erally tion ofthe caslng, a longitudinall slotted actuating screw engaging with. sainon-rotative nut and extraneous means for turning said actuating screwon its axis in either direction, substantially in the manner and for thepurpose described.

3. A mechanical' pencil of theC character designated, comprising atubular casing internally hexagonal in cross section and formed with alead holdin tip, a reversible lead-feed plunger, a travel in nut onwhich saidplun er is mounted, sai nut conforming perip erally to theinternal hexagonalcross section of the casing, a longitudinallyl and thefeed plunger P, is

` designated, comprism to the internal crossv secdesignated, ,comprlsin-slotted actuating screw engaging with said non-rotative nut, andextraneous means for turningsaid actuating screw on its axis vin eitherdirection, substantially inthe manner and for the purpose set forth.

4. A mechanical pencil of-` the character designated, comprising atubular casing formed with a'lead-holdin tip, a reversible lead-feedplunger, a travel ing nut on which said reversible plunger is mounted,means for rendering'said nut non-rotative within the casing, alongitudinallyl slotted reversible J' actuating screw engaging saidnon-rotative nut, and extraneous means for turning said actuating screwon its axis in either direction, substantlally in the manner and for thepurpose described.

`5. A mechanical pencil of the character designated, comprising atubular casing formed with a lead holding tip, a reversible lead-feedplunger, a travelling nut on which said plunger is mounted, means forrendering said nut non-rotatable within the casing, a ongitudinallyslotted actuating screw 4ensaid non-rotatable nut, a rotor atga 'n`.tacie to said actuating screw and protruding beyond the casing, andmeans for retainin said rotor in position against longitudina movementin either direction while permittin ofthe turnin thereof on its lon'itudina axis in either irection, substantia 1y in the manner and forthe purposedescribed. -v

encil of the character a tubular' casing formed with a lead ho din tip,a reversible lead-feed plunger, a trave ing nut onwhich 6. A mechanicalsaid plunger is mounted, means for renderf ing said nut non-rotatablewithin the casing,- a ongitudinally slotted actuating vscrew enga 'nsaid non-rotatable nut, a rotor attac e to said actuating screw andprotruding beyond the casing, and means for' retaining saidy rotor inposition against lon itudina movement in either direction lwhi epermittin of the turning thereof on its longitudina axisineitherdirection, said means comprising a peripheral annular slot on saidrotor, and an engaging snap boss on the casing, for the purpose, andsubstantially in the manner described.

7. A mechanicalpencil of the character a tubular casing formed with alead ho ding tip, a reversible lead-feed plunger, a travelling nut onwhich said plunger is mounted, means for renderin said nut non-rotatablewithin the casing, a ongitudinally slotted actuating screw enga 'n saidnon-rotatable nut, a rotor attac e to said actuating screw and protrud-,ing beyond the casing, and means for retainof' the turning thereof onits lon tudina axis .in either direction, said rotor 'lll las

movement in either direction whi e peringl formed with alead-replacement comartment having a detachable closure thereorsubstantially in the manner and for the purpose described.

8. A mechanical a tubular casing formed with a lead ho ding tip, areversible lead-feed plunger, a travelling nut on which said plunger ismounted, means for rendering said nut non-rotatable Within the casi-ng,

10 a longitudinally slotted actuating screw enl gaging saidnon-rotatable nut, a rotor at- \tached to said actuating screw andprotrud.` fing beyond the casing, and meansfor retaini encil of thecharactei 5 designated comprism mesme ing said rotor in position againstlon itudinal movement .1n either directlon whi e per- -mitting of theturning thereof on its longitudinal axis Iin either direction, saidrotor bemg formed with a lead-replacement compartment having adetachable closure consisting of a'rubber eraser, for the purpose 20 andsubstantially in the manner lset forth. l

